When a compound is broken down in the chemical reaction, its atoms are a. used to form new compound b. destroyed and new atoms are created c. considered exothermic

When a compound is broken down in the chemical reaction, its atoms are used to form new compound.

Option A

Explanation:

In a chemical reaction involving one or more compounds, the atoms in the compounds breaks and bombardment happens to create a new compound. The chemical formula of the new compound comes form its parent compound due to mixing of molecules.

Hence Option B is invalid as atoms are not destroyed to create a new molecule. All chemical reactions are not exothermic hence option C is invalid.

frequency or wavelenth of em radiation in a vacuum